Feed mechanism for sewing-machines.



No. 789.326. PMI-MED MAY 9, 1905. H. A. KLBMM.

FEED MEGHANISM EUR SEWING MACHINES.

APPLICATION FILED SEPT. 2s, 1904.

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'Nm 789,326. PATENTED MAY 9, 1905.

H. A. KLEMM.

FEED MECHANISM FR SEWING MAGHINES.

APPLICATION FILED SEPT.ZI, 1904.

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'HERMANN A. KLEi/IM, `OF N EFT YORK, N. Y., A'SSIGNOR TO JAMES D. LFYS, OF YONKERS, NEW YORK.

FEED MECHANISM FOFi SEWING-IWACl-HNES.

SPECIFICATION forming part of Letters Patent N0. 789,326, dated lVIay 9, 1905.

Application filed September 28, 1904. Serial No. 226,313.

To @ZZ whom it mfr/jl] concern:

Be it known that I, H enMANN A. Keanu, a citizen ol" the United States of America, and a resident of the borough of Bronx, New York city, State ot' N ew York, have invented certain new and useful Improvements in Feed Mechanism for Se\vingl\/Iacl1ines, ot which the Jollowing' is a specification.

My invention relaties to feed mechanism lor il'eeding knit and other loosely-intermeshed elastic fabrics such as are liable to pucker in the common positive-'feed apparatus; and it consists ot' the hereiua'tter-described improved diti'erential apjliaratus comprising a two-part feed-dog andthe means of ditl'erentially operating them, reference being made to the accompanying drawings, in which Figure i represents my improved two-part feed-dog and means for operating the same,

zo partly in side velevation and partly in vertical section, with a piece ot' work as being operated upon. Fig. 2 is an elevation of the same as seen looking from the right-hand side of Fig. 1, also with a piece of work as being 0perated upon. Fig. 3 is an elevation same as in Fig. 1, showing the feed-dogs in relation to each other different from that shown in Fig. 1. Fig. 4 is a detailin section on the line 2 .2 et' Fig. 2. Fig. is an elevation of parts ot' 3o the apparatus shown in Fig. i, showiuga modilication ot' some of the working parts. Fig. (i is an elevation of the apparatus ot' Fig. 5 as seen lrom the right-hand side olI said Fig. 5. Fig. T is a like elevation as Fig. 5 with a slight mcnlilicatitm thereo'l". Fig. 8 is a diagram showing an advantageous construction of the adjusting apparatus ot' the means ior operating the front feed-dog.

Other parts oi: the machine not necessary 4o to an understanding oll the invention claimed are omitted.

A represents in all the figures substantially the ordinary Vfecal-bar having the usual fork u, which rides on the eccentric oif the main shaft y] for being vertically operated to impart the like movements to the feed-dogs supported on it, whereof o represents the front dog and (l the rear dog. both oli which, according to my present invention, are mounted on said bar in the slideway e, allowing movements of them relatively to the feed-bar lengthwise of said bar. In Figs. l to 4, inelusive, the rear end ot' the feed-bar is pivoted at' to the upper end of a vertical support l1., tixedly connected at its lower end to a stationary rod or bar /f, so that saidA feedbar does not reciprocate. On said rod or bar v' in close proximity to support there is arranged in practically vertical 'alinement a rocking lever j, which is operated from an eccenoo tric 4 (see Fig. 8) ou the main shaft g] through the connecting-rod K, said rock-lever being connected by an ordinary connecting-rod Z with the front feed-dog c, so as to reciprocate said dog Vlor leed iug,said rod 1 being adjustable 6 5 in the slot 2 oll said rock-lever for varying the length oll the stitches. The rear feed-dog is connected by a flexibly-jointed link nl with a rearwardly-ranging rod n, litted in a bored slideway o under the surface of the table p, a 7o part o of which slideway is counterbored for enlargement 'for a collar q of said rod and a coiled spring fr thereon for retracting feeddog d, the forward movement of which is caused by the action of dog o on it. At the rear extremity ol:l the part o of the slideway a plug t is screwed in `lor a support for the end of spring 1', said spring being suitably tensioned to have power for retracting dog (Z. A nut u is screwed onto the extremity ot' rod 8o ln. outside ot' plug t to regulate the retracting movement ot' the dogd. The plug t is slotted at w1, and the rod carries a radial pin w, extending into said slot to prevent the rod from turning with the nut when the latter is being S5 screwed on or oi'i".

Alt will be seen that with the nut 11 set on rod w. so as to limit the retracting movement ot' dog ZM-say as indicated in Fig. Ledogd will rest while dog o is feeding the length of the 9o space between the two dogs and thereafter will move as Afar as dog c pushes it, thus difilierentially Ateedil'ig the parts of the goods 1/ respectively subject to the two dogs and to the presser-foot rl`he differential movements will be varied according as nutwy is adjusted more or less. li the nut/fv be slackened sul'liciently to allow collar (j to be thrust back against shoulder s, so that the two dogs have contact, as in Figs. 3 and 5, the feed of the two dogs will be equal, or practically so.

In Figs. 5 to '7, inclusive, I represent the feed-bar A pivoted at e' to the same roeli-lever j that carries the connecting-rod l, that operates the front feed-dog c, so that the said feed-bar slides in the usual manner, but without effect on the feed-dogs, which has the advantage of economy of construction as far as the support /t is concerned, and in Fig. 7 I represent the rod/ connected to the same pin e' by which rod K is connected to rock-lever j. This is also indicated by dotted lines in Fig.

In Fig. 8 I represent the slot 2 in the roel;- lever j, which operates the front feed-dog, formed eoiieentrically to the axis 3 of the eccentric 4 on the main shaft g. lVhcn said eecentric is at the point of full throw forward, so that, however, the rod K may be shifted along' said slot for varying the length of the stitches, the starting-point of dog c for beginning' the feed will always be the saine. rlhis insures overfeed by dog c relatively to the feed of dog (Z proportionately to its feed movements, whether they be longer or shorter` as adjusted by nut if, and thus results in more even and satisfactory worli.

That I claim as my invention isl. The combination in differentialfeed mechanism, of a feed-bar, means for efi'eeting` the usual vertical movements of the front end, two independently sliding feed dogs thereon, means for reciprocating the front'I dogon the said feed-bar, means for imparting feed movements to the rear dog through the instrumentality of the front feed-dog, and means to vary the movements of said rear feed-dog.

2. The combination in differentialfeed mechanism, of a feed-bar, means for effecting the usual vertical movements of the front end, two independently sliding' feed dogs thereon, whereof the front dog has reciprocating movement on said bar, and the rear dog has variable movement on the same relatively to the front feed-dog, means for giving the front dog its feed movement consisting of the rock-lever and rod connecting it and said feed-dog, means for operating the rock-lever, and means for giving the rear feed-dog its feed movement by the action of the front dog on it.

3. The combination in differential feed mechanism, of a feed-bar, means for effecting the usual vertical movements ofthe front end, two independently -sliding feed dogs thereon, whereof the front dog has reciproeating` movement on said bar, and the reai dog has variable movement on the sainerelatively to the front feed-dog, means for giving the front dog its feed movement, and means for giving the rear dog its feed movement consisting of the front dog and the retracting-spring.

et. The combination in differentialfeed mechanism, of a feed-bar, means for effecting the usual vertical movements of the front end of said bar, two independently-sliding feed-dogs thereon, means for variably reciprocating the front feed-dog for varying the length of the stitches without changing its starting-point and for variably reciprocating the rear feed-dog.

5. The combination in diderential -feed mechanism, of a feed-bar, means for effecting the usual vertical movements of the front end of said bar, two independently-sliding feed-dogs thereon, means for variably reciprocating the front feed-dog for varying the length of the stitches without changing its starting-point and for variably reciprocating the rear dog, and means for adjusting said rear feed-dog to feed in unison with the front feed-dog.

Signed at New York this 27th day of September, 1904.

HERMANN A. KLEMM. fitnessesz A. P. THAYER, C. SnDGwicK. 

